I read that today, it must be a bit much to show the sexual stuff of your mother who is still alive. I didn't think of that when I saw the show on Friday, the sex stuff was only a small part of it and not particularly explicit but of course relatives, their children, are still around, it all happened twenty odd years ago which isn't that long.
I found the business of him in the dentist's surgery with an unconscious patient more disturbing.
You are quite right about true crime stuff, it is far more horrifying than the usual cop stuff. James Nesbit is so believable in the part!
Some time ago I watched, ''Murdered by my boyfriend'', a true story, and that chilled me to the bone.